I really like this plugin. It may be true that there is a gamerule that disables the advancement broadcast, but this doesn't mean the plugin deserves less then 4 stars?
It works, gives you the possibility to change the broadcasted advancement message and is also very easy to use.
I don't see any problem with it and therefor it deserves 5 stars.
Indeed, you can use the /gamerule command to disable messages, but what if the administrator wants to change the message format in one world and fully disable it in another one? Or if you need to disable achievements saving in the lobby world, then there is no built-in option for this in Spigot or Paper.